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Finding the Fourth Proportional to 138,340.60, 207,705.30 and 85,852.60

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Solution

The fourth proportional to 138,340.60, 207,705.30 and 85,852.60 is: 128,899.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,340.60 : 207,705.30 = 85,852.60 : x
  2. Step 2: Convert to fraction form
    138,340.60/207,705.30 = 85,852.60/x
  3. Step 3: Cross multiply
    138,340.60x = 207,705.30 × 85,852.60
  4. Step 4: Simplify right side
    138,340.60x = 17,832,040,038.78
  5. Step 5: Solve for x
    x = 17,832,040,038.78/138,340.60
  6. Step 6: Final answer
    x = 128,899.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.